Adjustable v-belt sheave



May 28, 1946.

A. W. OEHLER ETAL ADJUSTABLE V-BELT sHElwE original Filed Feb. 19, 19442 Sheets-Sheet l FIG. I I

May 28, 1946. I A. w. QEHLER irrAL I 24011178 I ADJUSTABLE V-BELT SHEAVEOriginal Filed Feb. 19, 1944 2 Sheets-Sheet 2 Patented May 28, 1946 4UNITED STATES PATENT OFFICE ADJUSTABLE V-BELT SHEAVE Alvin W. Oehler andEric J. Johnson, Moline,

111., assignors to Deere &' Company, IlL, a corporation of IllinoisMoline,

Original application February 19, 1944, Serial 'No.

523,150. Dividedand this application December 9, 1944, Serial No.567,474

Claims. (01. 28753) fied and improved design, which is inexpensive tomanufacture but which is efficient in operation, strong and durable.Another bject relates to the provision of a self-contained adjustablesheave, which can be quickly and easily mounted on the end of a drivingor driven shaft and having novel and improved means for securing thsheave to the end of said shaft, which securing means is also adaptablefor quickly and easily removing the sheave from the shaft. Thisapplication is a division of our co-pending application, Serial 'No.523,150, filed February 19, 1944.

These and other objects and advantages of our invention will be apparentto those skilled in the art after a consideration of the followingdescription, in which reference is had to the drawings appended hereto,in which Figure 1 is a sectional view of an adjustable v-belt pulleyembodying the principles of our invention, taken along an axial lineindicated by l-l in Figure 2.

Figure 2 is a sectional view taken along a radial line 2-2 in Figure 1.

Figure 3 is a fragmentary end elevational view.

Figure 4 is a fragmentary sectional view taken axially through the outerend of the pulley hub and showing the securing means adapted forremoving the hub from the shaft.

Referring now to the drawings, the shaft is indicated by referencenumeral 5 and it can be either a driving or a driven shaft.- It isprovided with a keyway 6 extending axially inwardly from the end of theshaft and also an internally threaded bolt-receiving recess 1 in theendof the shaft, the outer end being indicated by reference numeral 8.

The adjustable sheave assembly is indicated in its entirety by referencenumeral H! and comprises an inner main hub II having an internalaperture !2 adapted to slidably fit over the end of the shaft 5 andhaving an axiall extending keyway l3 disposed in registry with thekeyway 6 in the shaft for receiving a key M adaptedto secure the hub l lto the shaft 5 to prevent relative rotation therebetween. The hub II isprovided with a smooth cylindrical outer surface l5,

on which is slidably mounted an outer hub 15,

having a smooth interior surface I! slidable on the outer surface 15.The inner hub II is provided with an axially extending keyway I8 in theouter surface l5, disposed in registry with an axially extending keywayl9 in the inner surface I! of the outer hub I6, the keyways I8 and I9being adapted to receive akey 2U.

The inner hub I l is provided with a flange por tiOn 25 extendinggenerally radiall outwardly from the inner end thereof, having anannular recess 26 in the outer portion of the flange 25 adapted toreceive a conical sheave member 21.

The conical member 21 is rigidly fixed to thefiange 25 by means of aplurality of securing bolts '28, having countersunk heads 29 engagingthe inner edge of the conical section 21 and extending thr ughperipherally spaced apertures 30 in the flange 25, and secured theretoby suitable nuts 3 I.

The outer hub I6 is provided with aradially extending flange portionhaving an annular recess 36 in the outer portion thereof disposed inopposed relation to the recess 26 and adapted to receive the inner edgeof a second conical sheave section 31, which is secured to the flange 35by therebetween a V-belt indicated by reference numeral 43, in a mannerwell-known to those skilled in the art.

The position of the outer hub I6 is controlled by means of a manuallyactuated control wheel having a hub 46 provided with internal threads 41adapted to engagethe outer end of the inner hub II, which is extendedappreciably beyond the end 8 of the shaft 5 and is threaded on its outersurface as indicated by reference numeral 48. The inner end of the hub46 of the control wheel 45 has a radially disposed face 49 adapted toengage the radially extending face 50 of the outer end of the outer hubIt, so that the position of the control wheel 45 determines the spacingbetween the conical faces 42.

The hand wheel 45 is securable in axially adiusted position by means ofa latch mechanism indicated in its entirety by reference numeral 53 andcomprising a latch pin 54 disposed generally parallel to the axis ofrotation of the assembly and extending through an aperture 55 in thehub- 45. The inner end of the latch pin 54 is projectable into .any ofseveral recesses 56 provided in suitable bosses 51 formed in the end ofthe outer hub I6. The latch pin 54 is provided with a handle portion 58turned at right angles to the pin 54, by means of which the pin 54 canbe retracted axially outwardly from the recesses 55. It will now beevident that with the latch pin 54 in retracted position, the wheel 45can be rotated relative to the hub l6 to adjust the latter axially alongthe hub II, but when the desired position of adjustment is attained, thelatch pin 54 can f be inserted into one of the recesses 55, therebypreventing any further rotation of the wheel 45 on the threads 48, sincethe hub I5 is prevented from any rotation on the inner hub I I by thekey 20. Thus, the entire sheave structure including the three hubs I I,It, 46 is rigidly locked together by th latch pin 54 and thus turns withthe shaft 5 as a unit.

The latch pin 54 urged into latched position within the recess 55, bymeans of a helical spring 59 encircling the pin 54 within an enlargedportion 60 of the aperture 55. The spring 59 is stressed in compressionbehind a washer BI encircling the latch pin 54 and secured by a suitablepin 62 inserted through a transverse hole in the ral with the hub 46.When the handle 58 is in the notch 65, the pin 54 is in latchedpositionwithin one of the recesses 56, but when theipin is retractedfrom one of the notches 56, the handle 58 can be turned out of registerwith the notch 65 and is thereby retained in retracted position bytheannular flange 66, in a position as indicated in dotted lines in Figures1 and 3. Thus, it is not necessary to manually hold thehandle 58 inretracted position when making adjustments of the hand wheel 45.- I

The means'for securing the inner hub I I on the end ofthe shaft 5 willnow be described. The outer end of the inner surface I2 of the hub II isthreaded as indicated at III to receive a bushing II which is threadedat I2 to coact with the thread Ill. The "bushing II is provided with ahexagonal head I3adapted to receive a wrench for tightening the head I3against the outer end of the hub II. The bushing II is apertured at I4to receive a bolt I5 axially therethrough, the end of the bolt beingsuitablythreaded to engage the threaded recess I in the end of the shaft5. The bolt I5 is provided with a head I6 which engages a washer whichin turn engages the head I3 of the bushing II, whereby the bolt I5 canbe tightened to force the inner hub II over the end of the shaft 5 untilthe inner end of the bushing II engages the end 8 of the shaft, therebysecurely holding the sheave on the shaft 5.

The sheave assembly II! can be removed from the shaft 5 easily andquickly by removing the bolt I5 andthebushing II from the hub II,inserting a spacing washer I8 (see Figure 4), and replacing the bushingII. tightened until the end of the bushing bears upon the. spacer I8,after which further rotation of the bushing 7| by means of a wrenchapplied to the head I3 draws the hub II off the shaft 5, the outer hubI6, hand wheel 45, and sheave sections 21, 31 also coming off the shaft5 in assembled relation. A small aperture I9 is provided in the hub IInear the inner end thereof to receiv a nail or small drill which can beinserted in back of the key I4 so that the latter is shifted through thekeyway 6 along with the hub I I.

We claim:

1. In power transmitting mechanism, a shaft having a threaded recess inthe outer end thereof, a hub non-rotatably mounted on said shaft andhaving an extension beyond the outer end of the latter, internal threadsin said hub extension, a bushing adapted to be inserted into said hubextension and having external threads engageable with said internalthreads and a head portion engageable with the outer end of said hub,and a bolt adapted to be inserted through said bushing and engageablewith said threaded recess in said shaft, said bolt having a head adaptedto engage the outer end of said bushing to draw the latter into abutmentwith the outer end of said shaft.

2. In power transmitting mechanism, a shaft having a threaded'recess inthe outer end thereof, a hub non-rotatably mounted on said shaft andhavingan extension beyond the outer end of the latter, internal threadsin said hub extension, a bushing adapted to be inserted into said hubextension and having external threads engageable with said internalthreads and a head portion engageable with the outer end of said hub,and having an internal bore, a bolt insertable through said bore andengageable with said'recess for securing the hub to the end of saidshaft, and a spacer adapted to be inserted between said bushing and saidshaft to space the head of said bushing outwardly'of said hub to providefor drawing the latter off said shaft by turning said bushing withinsaid internal threads in said hub.

The bushing is then ber adapted to be inserted into said hub extensionand having external threads engageable with said internal threads, andthreaded means engaging the outer end of said hollow member andextending through the latter and secured to said shaft for drawing saidhub on said shaft to an extent limited by said hollow member moving intoabutment with said shaft.

4. In power transmitting mechanism, a shaft, a hub mounted on said shaftand having an extension beyond the outer end of the latter, internalthreads in said hub extension, a hollow member adapted to be insertedinto said hub extension and having external threads engageable with saidinternal threads, threaded means engaging the outer end of said hollowmember and extending through the latter and secured to said shaft fordrawing said hub on said shaft to an extent limited by said hollowmember moving into abutment with said shaft, and a spacer adapted to beinserted between said hollow member and said shaft to space the outerend of said member outwardly of said hub to provide for drawing thelatter off said shaft by turning said member within said internalthreads in said hub.

internal threads, and a head portion engageable to be inserted betweensaid bushing and said shaft to space the head of said bushing outwardlyof said hub to provide for drawing the latter off said shaft byscrewingsaid bushing into said in- 5 ternally threaded hub.

ALVIN w. OEHLER. ERIC J. JOHNSON.

